How to automat editing of several files in Vim?

Question

I have a multitude of files in each of which I want to, say, delete lines 1 through 55, add a comment leader (e.g., //) on lines 25 through 35, and then save th

Answer 1

You can accomplish this elegantly with ed, the unix line editor, the ancestor of vi.

fix_file () {
  ed -s "$1" <<-'EOF'
    1,55d
    25,35s_.*_// &_
    wq   
EOF
}

Now, for each file F you need, just execute fix_file F.